Software isn't as good at detecting fraud as you think, not yet awhiles. Otherwise HMRC wouldn't bother sending inspectors out 
I've been in this trade approaching 40 years now, and I've seen the development of the automated side of accounts over the years. Hell, I've even configured a few of them at the implementation stage.
The overwhelming majority of small business owners simply don't have the time, inclination or knowledge to set the computer up properly. and get the transactions in the system right. They then give their accountant a carrier bag full of receipts and a memory stick a set of accounts that make no sense whatever and the accountant has to start all over again from incomplete records.
You also then have organisations with numerous subsidiaries, holding companies, parent companies, directors who are also directors of purportedly 'unrelated' companies, you name it. A software program isn't going to be able to think laterally enough. It's like putting a jigsaw together when you only have half the pieces and no box.
It also takes someone seriously knowledgeable about accountancy to program the computer in the first place, and there aren't enough of them around.
Anyway... we have digressed.
Yes, OP - courses at your local college would be the best bet, there are a lot of online ones, but a fair few of those might not be quite what they say they are, qualification-wise, if you get my drift.